Effects of standing acoustic fields on ring-shaped microstructures

What is it about?

This article is related to our previous publication (https://doi.org/10.1063/5.0020930) where we presented a novel method called chain-of-spheres to analytically evaluate the acoustic radiation forces and torques on intricate structures. Here we apply the methodology to micro-rings and show how the rings can be rotated and moved in standing acoustic waves. Resonances are found in which the force and torque values exhibit abrupt jumps. These can be used for particle manipulation.

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Why is it important?

The results are encouraging to apply the chain-of-spheres approach to different structures. The low computational cost of the method is shown to open new avenues in developing acoustics-based particle manipulation systems. The article also shows potential fallacies of the approach, in terms of torque evaluations in particular.